Ground connection



June 19, 1928. 1,673,946

W. P. MARR GROUND CONNECTION Filed Oct. 23, 1924 Inventor. W/M {QM patented June 19, 1928.

UNITED STATES WILLIAM P. MARE, F TORONTO, ONTARIO, CANADA.

GROUND CONNECTION.

Application filed October 23, 1924. Serial No. 745,474.

The principal objects of the invention are, to facilitate the grounding of electric services, and to devise a connection which will dispense with the necessity of soldering the ground strip with the terminal wires.

The principal feature of the invention consists in embracing the end of the grounding terminal strip with a rigid member and securing the terminal wires in electric contact with the strip with a binding screw.

In the drawings, Figure l is a perspective view of my improved ground connection.

Figure 2 is a longitudinal mid-sectional view.

It has been the custom in installing electric services to solder the ground loops of a service to a copper strip which is secured to a water pipe connected with the ground and the soldering of the strip is more or less insecure, because of the fact that the wires are inserted in a loop. Further, the soldering requires the use of a blow torch which is frequently diiiicult to handle in cramped positions.

According to the present invention the copper terminal strip 1 is bent at one end to form a loop 2 and the looped end of the strip is slipped into a rigid enclosing memher 3 which may be formed of heavy steel plate curled at the end to form a substantially cylindrical hole.

The end 4 of: the curled portion of the member 3 is spaced from the straight bacl: portion 5 so that the thin copper strip 1 may be inserted therebetween with the looped end 2 fitting snugly in the curled portion of the rigid member.

A threaded hole 6 is arranged in the member 3 and a. registering hole is formed in the terminal strip. This threaded hole is preferably the same diameter as the diameter of the opening in the loop 2 of the terminal strip and a grub screw 7 is inserted into the threaded hole.

The bolt 8 extends through the straight portion 5 of the member 3 and through the strip 1 below the looped end of the rigid member and co-operates with the nut 10 to firmly clamp the member 3 to the strip.

In the use of this device the free end of the strip 1 which is provided with a series of holes properly spaced throughout its length is bent around a pipe or other grounding medium and is secured by the bolt 8 55 which is passed through one of the holes in the strip. The ground wires 9 of the electric service are then bared at the ends and inserted into the loop 2. The screw 7 is then screwed in to tightly bind the terminal wires against the inner surface of the copper strip and a perfect electric contact is ensured.

It will be readily understood that the handling of such a connection renders the labor very simple but very effective as the grub screw binds tightly into the wires and biting into the copper it will remain locked securely against accidental displacement.

What I claim as my invention is 1. In a ground connection, the combination with a thin conductor strip, adapted to be secured in contact with a grounding medium, of a rigid member looped at one end and embracing said strip in interlocked relation, means for securing said conductor strip to a grounding medium and means independent of the conductor securing means secured in the looped end of said rigid member for securing the ground wires within the embraced end of said strip.

2. In a ground connection, the combina tion with a thin conductor strip, of a rigid member embracing one end of the strip, means for securing said strip to a ground ing medium and to said rigid member, and means secured in said rigid member for clamping the ground wires to said strip independent of said securing means.

3. A groundconnection, comprising a thin copper strip having a looped end, a looped member of rigid material embracing the looped end of the strip and having its other end extending in a straight shank, a bolt passing through said straight shank and binding the copper strip thereto, and a binding screw threaded in said rigid member and extending into the loop of the copper strip.

a. A ground connection, comprising a flat strip of copper having one end bent into a. loop, a strip of a rigid metal bent into a loop to embrace the loop 01 the copper strip and having the end of its loop spaced from the back to allow the strip to be inserted therein, abolt passing through the rigid member and said strip, and a binding screw threaded in the rigid member and extending into the loop of the copper strip.

WILLIAM P. MARE. 

